And not only was she pregnant, she was VERY pregnant. Doctors said she was at 38 weeks.

"There are no words to describe the range of feelings associated with being told that you're having a baby -- in 30 minutes," Michael said.

Michael and Stephanie Jaegers got a big surprise when Shaun came into the world (Family photos)

Within 30 minutes, doctors were preparing Stephanie to give birth.

"It wasn't until we heard the heartbeat that reality set in," Michael said.

At 3:50 a.m. on Wednesday, Shaun Jude Jaegers came into the world. At 7 pounds, 3 oz and 19 inches long, he appeared to be a very healthy baby. That's even more amazing considering they had no prenatal care.

So how did Stephanie make it through an entire pregnancy without ever knowing she was pregnant?

Michael explained in a Facebook post, "Here's what we can gather based on the info given to us from the doctors here at Piedmont Henry Hospital. Steph was diagnosed with pre-menopause awhile back which would justify the hormone imbalance also associated with a pregnancy. Shaun was also breech throughout the entire pregnancy which prevented him from moving around to indicate to Steph that he was in there and his position made it to where Steph didn't "show". The most bizarre part is she continued to have a menstrual cycle, which the hospital tells us is rare, but can happen. Lastly, Steph broke her ankle a couple of weeks ago and was laid up for the last couple of weeks limiting her movements. All of this together ruled out in our minds even the remote possibility of a pregnancy."

The couple were already parents to three children -- two boys ages 16 and 11, and a girl who turns 3 later this year. And when Stephanie gave birth to her daughter, doctors told her it was unlikely that she'd be able to have another child.

Michael said the two boys are taking the news of a new addition to the family in stride, but said it was taking his daughter some time to get used to not being the youngest anymore.